According to the versions of the curl packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities :
curl 7.1.1 to and including 7.75.0 is vulnerable to an ‘Exposure of Private Personal Information to an Unauthorized Actor’ by leaking credentials in the HTTP Referer: header. libcurl does not strip off user credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second HTTP request. (CVE-2021-22876)
curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the code for CURLOPT_SSL_CIPHER_LIST when libcurl is built to use the Schannel TLS library. The selected cipher set was stored in a single ‘static’ variable in the library, which has the surprising side-effect that if an application sets up multiple concurrent transfers, the last one that sets the ciphers will accidentally control the set used by all transfers. In a worst-case scenario, this weakens transport security significantly. (CVE-2021-22897)
curl 7.7 through 7.76.1 suffers from an information disclosure when the -t
command line option, known as CURLOPT_TELNETOPTIONS
in libcurl, is used to send variable=content pairs to TELNET servers. Due to a flaw in the option parser for sending NEW_ENV variables, libcurl could be made to pass on uninitialized data from a stack based buffer to the server, resulting in potentially revealing sensitive internal information to the server using a clear-text network protocol. (CVE-2021-22898)
When curl is instructed to download content using the metalink feature, thecontents is verified against a hash provided in the metalink XML file.The metalink XML file points out to the client how to get the same contentfrom a set of different URLs, potentially hosted by different servers and theclient can then download the file from one or several of them. In a serial orparallel manner.If one of the servers hosting the contents has been breached and the contentsof the specific file on that server is replaced with a modified payload, curlshould detect this when the hash of the file mismatches after a completeddownload.
It should remove the contents and instead try getting the contentsfrom another URL. This is not done, and instead such a hash mismatch is onlymentioned in text and the potentially malicious content is kept in the file ondisk. (CVE-2021-22922)
When curl is instructed to get content using the metalink feature, and a user name and password are used to download the metalink XML file, those same credentials are then subsequently passed on to each of the servers from which curl will download or try to download the contents from. Often contrary to the user’s expectations and intentions and without telling the user it happened. (CVE-2021-22923)
libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of them matches the setup.Due to errors in the logic, the config matching function did not take ‘issuercert’ into account and it compared the involved paths case insensitively,which could lead to libcurl reusing wrong connections.File paths are, or can be, case sensitive on many systems but not all, and caneven vary depending on used file systems.The comparison also didn’t include the ‘issuer cert’ which a transfer can setto qualify how to verify the server certificate. (CVE-2021-22924)
curl supports the -t
command line option, known as CURLOPT_TELNETOPTIONS
in libcurl. This rarely used option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for sending NEW_ENV
variables, libcurlcould be made to pass on uninitialized data from a stack based buffer to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear- text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing the string provided by the application. (CVE-2021-22925)
Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.
#%NASL_MIN_LEVEL 70300
##
# (C) Tenable Network Security, Inc.
##
include('deprecated_nasl_level.inc');
include('compat.inc');
if (description)
{
script_id(157964);
script_version("1.5");
script_set_attribute(attribute:"plugin_modification_date", value:"2023/11/09");
script_cve_id(
"CVE-2021-22876",
"CVE-2021-22897",
"CVE-2021-22898",
"CVE-2021-22922",
"CVE-2021-22923",
"CVE-2021-22924",
"CVE-2021-22925"
);
script_xref(name:"IAVA", value:"2021-A-0437-S");
script_xref(name:"IAVA", value:"2021-A-0352-S");
script_name(english:"EulerOS Virtualization 3.0.6.0 : curl (EulerOS-SA-2022-1062)");
script_set_attribute(attribute:"synopsis", value:
"The remote EulerOS Virtualization host is missing multiple security updates.");
script_set_attribute(attribute:"description", value:
"According to the versions of the curl packages installed, the EulerOS Virtualization installation on the remote host is
affected by the following vulnerabilities :
- curl 7.1.1 to and including 7.75.0 is vulnerable to an 'Exposure of Private Personal Information to an
Unauthorized Actor' by leaking credentials in the HTTP Referer: header. libcurl does not strip off user
credentials from the URL when automatically populating the Referer: HTTP request header field in outgoing
HTTP requests, and therefore risks leaking sensitive data to the server that is the target of the second
HTTP request. (CVE-2021-22876)
- curl 7.61.0 through 7.76.1 suffers from exposure of data element to wrong session due to a mistake in the
code for CURLOPT_SSL_CIPHER_LIST when libcurl is built to use the Schannel TLS library. The selected
cipher set was stored in a single 'static' variable in the library, which has the surprising side-effect
that if an application sets up multiple concurrent transfers, the last one that sets the ciphers will
accidentally control the set used by all transfers. In a worst-case scenario, this weakens transport
security significantly. (CVE-2021-22897)
- curl 7.7 through 7.76.1 suffers from an information disclosure when the `-t` command line option, known as
`CURLOPT_TELNETOPTIONS` in libcurl, is used to send variable=content pairs to TELNET servers. Due to a
flaw in the option parser for sending NEW_ENV variables, libcurl could be made to pass on uninitialized
data from a stack based buffer to the server, resulting in potentially revealing sensitive internal
information to the server using a clear-text network protocol. (CVE-2021-22898)
- When curl is instructed to download content using the metalink feature, thecontents is verified against a
hash provided in the metalink XML file.The metalink XML file points out to the client how to get the same
contentfrom a set of different URLs, potentially hosted by different servers and theclient can then
download the file from one or several of them. In a serial orparallel manner.If one of the servers hosting
the contents has been breached and the contentsof the specific file on that server is replaced with a
modified payload, curlshould detect this when the hash of the file mismatches after a completeddownload.
It should remove the contents and instead try getting the contentsfrom another URL. This is not done, and
instead such a hash mismatch is onlymentioned in text and the potentially malicious content is kept in the
file ondisk. (CVE-2021-22922)
- When curl is instructed to get content using the metalink feature, and a user name and password are used
to download the metalink XML file, those same credentials are then subsequently passed on to each of the
servers from which curl will download or try to download the contents from. Often contrary to the user's
expectations and intentions and without telling the user it happened. (CVE-2021-22923)
- libcurl keeps previously used connections in a connection pool for subsequenttransfers to reuse, if one of
them matches the setup.Due to errors in the logic, the config matching function did not take 'issuercert'
into account and it compared the involved paths *case insensitively*,which could lead to libcurl reusing
wrong connections.File paths are, or can be, case sensitive on many systems but not all, and caneven vary
depending on used file systems.The comparison also didn't include the 'issuer cert' which a transfer can
setto qualify how to verify the server certificate. (CVE-2021-22924)
- curl supports the `-t` command line option, known as `CURLOPT_TELNETOPTIONS`in libcurl. This rarely used
option is used to send variable=content pairs toTELNET servers.Due to flaw in the option parser for
sending `NEW_ENV` variables, libcurlcould be made to pass on uninitialized data from a stack based buffer
to theserver. Therefore potentially revealing sensitive internal information to theserver using a clear-
text network protocol.This could happen because curl did not call and use sscanf() correctly whenparsing
the string provided by the application. (CVE-2021-22925)
Note that Tenable Network Security has extracted the preceding description block directly from the EulerOS security
advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional
issues.");
# https://developer.huaweicloud.com/ict/en/site-euleros/euleros/security-advisories/EulerOS-SA-2022-1062
script_set_attribute(attribute:"see_also", value:"http://www.nessus.org/u?0c3c989d");
script_set_attribute(attribute:"solution", value:
"Update the affected curl packages.");
script_set_cvss_base_vector("CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N");
script_set_cvss_temporal_vector("CVSS2#E:POC/RL:OF/RC:C");
script_set_cvss3_base_vector("CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N");
script_set_cvss3_temporal_vector("CVSS:3.0/E:P/RL:O/RC:C");
script_set_attribute(attribute:"cvss_score_source", value:"CVE-2021-22925");
script_set_attribute(attribute:"cvss3_score_source", value:"CVE-2021-22922");
script_set_attribute(attribute:"exploitability_ease", value:"Exploits are available");
script_set_attribute(attribute:"exploit_available", value:"true");
script_set_attribute(attribute:"vuln_publication_date", value:"2021/04/01");
script_set_attribute(attribute:"patch_publication_date", value:"2022/02/12");
script_set_attribute(attribute:"plugin_publication_date", value:"2022/02/12");
script_set_attribute(attribute:"plugin_type", value:"local");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:curl");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libcurl");
script_set_attribute(attribute:"cpe", value:"p-cpe:/a:huawei:euleros:libcurl-devel");
script_set_attribute(attribute:"cpe", value:"cpe:/o:huawei:euleros:uvp:3.0.6.0");
script_set_attribute(attribute:"stig_severity", value:"I");
script_end_attributes();
script_category(ACT_GATHER_INFO);
script_family(english:"Huawei Local Security Checks");
script_copyright(english:"This script is Copyright (C) 2022-2023 and is owned by Tenable, Inc. or an Affiliate thereof.");
script_dependencies("ssh_get_info.nasl");
script_require_keys("Host/local_checks_enabled", "Host/cpu", "Host/EulerOS/release", "Host/EulerOS/rpm-list", "Host/EulerOS/uvp_version");
exit(0);
}
include("audit.inc");
include("global_settings.inc");
include("rpm.inc");
if (!get_kb_item("Host/local_checks_enabled")) audit(AUDIT_LOCAL_CHECKS_NOT_ENABLED);
var release = get_kb_item("Host/EulerOS/release");
if (isnull(release) || release !~ "^EulerOS") audit(AUDIT_OS_NOT, "EulerOS");
var uvp = get_kb_item("Host/EulerOS/uvp_version");
if (uvp != "3.0.6.0") audit(AUDIT_OS_NOT, "EulerOS Virtualization 3.0.6.0");
if (!get_kb_item("Host/EulerOS/rpm-list")) audit(AUDIT_PACKAGE_LIST_MISSING);
var cpu = get_kb_item("Host/cpu");
if (isnull(cpu)) audit(AUDIT_UNKNOWN_ARCH);
if ("x86_64" >!< cpu && cpu !~ "^i[3-6]86$" && "aarch64" >!< cpu) audit(AUDIT_LOCAL_CHECKS_NOT_IMPLEMENTED, "EulerOS", cpu);
if ("aarch64" >!< cpu) audit(AUDIT_ARCH_NOT, "aarch64", cpu);
var flag = 0;
var pkgs = [
"curl-7.61.1-2.h16.eulerosv2r8",
"libcurl-7.61.1-2.h16.eulerosv2r8",
"libcurl-devel-7.61.1-2.h16.eulerosv2r8"
];
foreach (var pkg in pkgs)
if (rpm_check(release:"EulerOS-2.0", reference:pkg)) flag++;
if (flag)
{
security_report_v4(
port : 0,
severity : SECURITY_WARNING,
extra : rpm_report_get()
);
exit(0);
}
else
{
var tested = pkg_tests_get();
if (tested) audit(AUDIT_PACKAGE_NOT_AFFECTED, tested);
else audit(AUDIT_PACKAGE_NOT_INSTALLED, "curl");
}
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22876
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22897
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22898
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22922
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22923
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22924
cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22925
www.nessus.org/u?0c3c989d